Kaal Dashaa and Chakra Dashaa are two independent Dashaa systems and have nothing to do with Kaal Chakra Dashaa system.

Chakra Dashaa
[BPHS, Ch. 46, Sl. 50-51]
Chakra Dashaa is described in BPHS, Ch. 46, Sl. 50-51. It is a very easy to calculate Dashaa (at least the Mahaa-Dashaa of it):

1. If the birth is at night, the Dashaa will commence from Lagna Raashi.
2. If the birth is during the day, the Dashaa will start from the Raashi, in which the Lord of Lagna is placed.
3. If the birth is during Sandhyaa, the Dashaa will begin from the Raashi of the second Bhaav.

The Dashaa of each Raashi is 10 years. As it is the Dashaa system of the 12 Raashi in the Zodiac, it has been named, as Chakra Dashaa.

'Sandhyaa' is the time span when Sun is ascending (we can track this verifying if Sun is posited in the first Bhava in Chalit Chakra) or descending (Sun in 7th Bhava in Chalit Chakra). The time span of Sandhyaa is 5 Ghatikaa or two hours.

This Dashaa isn't included in any software, nevertheless Paraashar mentions in at a very early chapter in BPHS and therefore we can assume that it is a very fundamental and important Dashaa - in fact he rejects all other Raashi Dashaa systems ('not appropriate' ) except Varnad, Niryana Shool and Chakra Dashaa (this includes most known and used 'Chara Dashaa' as well!). He really denotes Chakra Dashaa as '*the* (!) Dashaa system of the 12 Raashis in the Zodiac'! (Varnada and Niryana Shoola Dashaa are 'AyurDashaas' indicating longevity, death or at least severe problems.)

Each Raashi period of 10 years leads to a total sum of 120 years, the maximum life span of human beings in Kali Yug, like in Vinshottaree Dashaa.

Lagna is related to night births, Lagna Lord to day births. This is logical because planets are carrying activities with regard to the Raashi/Bhaav they are lording, *they* are the active energies and principles. Sandhya is a time of transition and transformation: The Sun is wandering from day into night (from the upper half - the bright half of the day above the Ascendant - into the lower half - the dark half of the day below the ascendant). Starting Maha-dashaa for natives born during Sandhyaa time are started from 2nd Bhaav/Lagna.

Note: This principle could be referred to two conditional Dashaas as well, Shodashottaree Dashaa and Shat Trimsa Sama Dashaa. I do not use them - even if applicable - when the native is born during Sandhyaa.

Interpretation: Due to Parashara's highest estimation of Chakra Dashaa it must be a 'Phalit Dashaa', a Dashaa suitable and applicable for *all* themes and topics.

Antar-Dashaa of Raashi
[BPHS, Ch. 51]
5. The Antar-dashaa of Raashi is worked out by dividing the Dashaa years by 12. Pratyantar Dashaa of the Antar-dashaa are also calculated in the same manner.

6. The Antar [Pratyantar] Dashaa will start from the Dashaa Raashi, or from the Raashi 7th there from, whichever is stronger.

The Antar [Pratyantar] Dashaa are in the onwards order, if the Dashaa Raashi is odd and in the reverse order, if it is even.

7-12. O Brahmin! Now I will acquaint you with the special characteristics of the order of the Antar Dashaa of the Raashi.

If the Dashaa Raashi is a Movable one [Aries, Cancer, Libra, Capricorn], the Antar Dashaa of the 12 Raashi are in the onwards, or reverse order.

If the Dashaa Aashraya Raashi is a Fixed one [Taurus, Leo, Scorpio, Aquarius], the Antar Dashaa will start from it and thereafter there will be an Antar Dashaa of every sixth Raashi.

If the Dashaa Aashraya Raashi is a Dual one [Gemini, Virgo, Sagittarius, Pisces], the first Antar Dashaa will belong to it. Thereafter there will be Antar Dashaa of Raashi in Kendra to it, Raashi in Kendra to the 5th from it and Raashi in Kendra to the 9th from it.

In the case of all kinds of Raashi, namely Movable, Fixed, or Dual, the order will be onwards, if the Dashaa Aashraya Raashi is an odd one and in the reverse order, if it is an even one.

Calculation of Chakra Dashaa
(c) 2008 by Revati

Preliminary:
MD 10 years = 120 months / 12 Antar-Dashaa = 10 months/Antar-Dashaa
AD 10 months = 300 days / 12 Pratyantar Dashaa = 25 days/Pratyantar Dashaa
PD 25 days / 12 Sookshm Dashaa = 2 days/Sookshm Dashaa

[days of a month:] Jan 31, Feb 28/29, Mar 31, Apr 30, May 31, Jun 30, Jul 31, Aug 31, Sep 30, Oct 31, Nov 30, Dec 31

How to Find Your Current Dashaa Period:
1. Look which of the three options apply to you: (a) nighttime birth, (b) daytime birth,  (c) birth during Sandhyaa (Sun within 15° distance from Lagna cusp)
2. Identify your current Mahaa-dashaa period.
3. Identify your current Antar-Dashaa period and correct it with your exact birth time (e.g. if you are born on an 18th of a month, you have to add 18 days to the provided table).
4. Identify your current Pratayantar Dashaa period and correct it with your exact birth time.

Note 1: The start/end of Antar-dashaa/Pratyantar-dashaa periods can vary one or two days.
Note 2: Entry chart casting is still difficult because exact entry periods are missing.

Mahaa-dashaa Calculation

[Odd Raashi]   --   At Night/During Day/During Sandhyaa
Lagna/Lagna Lord/2nd from Lagna 0-10 years
2nd from Lagna/2nd from Lagna Lord/3rd from Lagna 10-20 years
3rd from Lagna/3rd from Lagna Lord/4th from Lagna 20-30 years
4th from Lagna/4th from Lagna Lord/5th from Lagna 30-40 years
5th from Lagna/5th from Lagna Lord/6th from Lagna 40-50 years
6th from Lagna/6th from Lagna Lord/7th from Lagna 50-60 years
7th from Lagna/7th from Lagna Lord/8th from Lagna 60-70 years
8th from Lagna/8th from Lagna Lord/9th from Lagna 70-80 years
9th from Lagna/9th from Lagna Lord/10th from Lagna 80-90 years
10th from Lagna/10th from Lagna Lord/11th from Lagna 90-100 years
11th from Lagna/11th from Lagna Lord/12th from Lagna 100-110 years
12th from Lagna/12th from Lagna Lord/1st from Lagna 110-120 years

[Even Raashi]  --   At Night/During Day/During Sandhyaa
Lagna/Lagna Lord/2nd from Lagna 0-10 years
12th from Lagna/12th from Lagna Lord/Lagna 10-20 years
11th from Lagna/11th from Lagna Lord/12th from Lagna 20-30 years
10th from Lagna/10th from Lagna Lord/11th from Lagna 30-40 years
9th from Lagna/9th from Lagna Lord/10th from Lagna 40-50 years
8th from Lagna/8th from Lagna Lord/9th from Lagna 50-60 years
7th from Lagna/7th from Lagna Lord/8th from Lagna 60-70 years
6th from Lagna/6th from Lagna Lord/7th from Lagna 70-80 years
5th from Lagna/5th from Lagna Lord/6th from Lagna 80-90 years
4th from Lagna/4th from Lagna Lord/5th from Lagna 90-100 years
3rd from Lagna/3rd from Lagna Lord/4th from Lagna 100-110 years
2nd from Lagna/2nd from Lagna Lord/3rd from Lagna 110-120 years

Antar-Dashaa Calculation
Movable Signs (1st AD of 1st or 7th from MD Raashi, whichever is stronger)
(odd signs regular, even signs reverse)
Aries (1st/7th) - Cancer (1/7) - Libra (1/7) - Capricorn (1/7)
(1st AD) Aries/Libra - Cancer/Capricorn - Libra/Aries - Capricorn/Cancer
(2nd AD) Taurus/Scorpio - Gemini/Sagittarius - Scorpio/Taurus - Sagittarius/ Gemini
(3rd AD) Gemini/Sagittarius - Taurus/Scorpio - Sagittarius/ Gemini - Scorpio/Taurus
(4th AD) Cancer/Capricorn - Aries/Libra - Capricorn/Cancer - Libra/Aries
(5th AD) Leo/Aquarius - Pisces/Virgo - Aquarius/Leo - Virgo/Pisces
(6th AD) Virgo/Pisces - Aquarius/Leo - Pisces/Virgo - Leo/Aquarius
(7th AD) Libra/Aries - Capricorn/Cancer - Aries/Libra - Cancer/Capricorn
(8th AD) Scorpio/Taurus - Sagittarius/ Gemini - Taurus/Scorpio - Gemini/Sagittarius
(9th AD) Sagittarius/ Gemini - Scorpio/Taurus - Gemini/Sagittarius - Taurus/Scorpio
(10th AD) Capricorn/Cancer - Libra/Aries - Cancer/Capricorn - Aries/Libra
(11th AD) Aquarius/Leo - Virgo/Pisces - Leo/Aquarius - Pisces/Virgo
(12th AD) Pisces/Virgo - Leo/Aquarius - Virgo/Pisces - Aquarius/Leo

Fixed Signs (1st AD of 1st or 7th from MD Raashi, whichever is stronger)
(odd signs regular, even signs reverse)
Taurus (1st/7th) - Leo (1/7) - Scorpio (1/7) - Aquarius (1/7)
(1st AD) Taurus/Scorpio - Leo/Aquarius - Scorpio/Taurus - Aquarius/Leo
(2nd AD) Sagittarius/ Gemini - Capricorn/Cancer - Gemini/Sagittarius - Cancer/Capricorn
(3rd AD) Cancer/Capricorn - Gemini/Sagittarius - Capricorn/Cancer - Sagittarius/ Gemini
(4th AD) Aquarius/Leo - Scorpio/Taurus - Leo/Aquarius - Taurus/Scorpio
(5th AD) Virgo/Pisces - Aries/Libra - Pisces/Virgo - Libra/Aries
(6th AD) Aries/Libra - Virgo/Pisces - Libra/Aries - Pisces/Virgo
(7th AD) Scorpio/Taurus - Aquarius/Leo - Taurus/Scorpio - Leo/Aquarius
(8th AD) Gemini/Sagittarius - Cancer/Capricorn - Sagittarius/ Gemini - Capricorn/Cancer
(9th AD) Capricorn/Cancer - Sagittarius/ Gemini - Cancer/Capricorn - Gemini/Sagittarius
(10th AD) Leo/Aquarius - Taurus/Scorpio - Aquarius/Leo - Scorpio/Taurus
(11th AD) Pisces/Virgo - Libra/Aries - Virgo/Pisces - Aries/Libra
(12th AD) Libra/Aries - Pisces/Virgo - Aries/Libra - Virgo/Pisces

Dual Signs (1st AD of 1st or 7th from MD Raashi, whichever is stronger)
(odd signs regular, even signs reverse, Kendra rule)
Gemini (1st/7th) - Virgo (1/7) - Sagittarius (1/7) - Pisces (1/7)
(1st AD) Gemini/Sagittarius - Virgo/Pisces - Sagittarius/ Gemini - Pisces/Virgo
(2nd AD) Virgo/Pisces - Gemini/Sagittarius - Pisces/Virgo - Sagittarius/ Gemini
(3rd AD) Sagittarius/ Gemini - Pisces/Virgo - Gemini/Sagittarius - Virgo/Pisces
(4th AD) Pisces/Virgo - Sagittarius/ Gemini - Virgo/Pisces - Gemini/Sagittarius
(5th AD) Libra/Aries - Taurus/Scorpio - Aries/Libra - Scorpio/Taurus
(6th AD) Capricorn/Cancer - Aquarius/Leo - Cancer/Capricorn - Leo/Aquarius
(7th AD) Aries/Libra - Scorpio/Taurus - Libra/Aries - Taurus/Scorpio
(8th AD) Cancer/Capricorn - Leo/Aquarius - Capricorn/Cancer - Aquarius/Leo
(9th AD) Aquarius/Leo - Capricorn/Cancer - Leo/Aquarius - Cancer/Capricorn
(10th AD) Taurus/Scorpio - Libra/Aries - Scorpio/Taurus - Aries/Libra
(11th AD) Leo/Aquarius - Cancer/Capricorn - Aquarius/Leo - Capricorn/Cancer
(12th AD) Scorpio/Taurus - Aries/Libra - Taurus/Leo - Libra/Aries

Antar-Dashaa

Pratyantar Dashaa

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